Malicious PDF — malware analysis report

Static analysis result for SHA-256 5139d1eaa9fcd7f9…

MALICIOUS

PDF

46.3 KB Created: 2021-06-03 08:50:55 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-11-02
MD5: 8989dfaee09d9f024caf31671adab5d0 SHA-1: 8b73f0fb7f713ca96e49ca6b2f3c667d86f39395 SHA-256: 5139d1eaa9fcd7f98ec81371edd1d10c0184a30b4f4079f8c403c922e2dc9126
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains multiple links that redirect to malicious infrastructure, specifically promoting 'free generator / game hack' lures. The ML classifier strongly indicated maliciousness. The document body and embedded URLs suggest a social engineering tactic to trick users into visiting potentially harmful sites, likely for credential harvesting or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9748

Heuristics 4

  • PDF links to a 'free generator / game hack' redirector critical PDF_GAME_HACK_REDIRECT_LURE
    PDF's clickable action targets a redirector of the form /app/<id>/<slug>-game-hack — the landing-page shape of a large SEO 'free spins / generator / game hack' lure family that funnels victims through rotating disposable hosts to a malware/scam payload. The multi-link variants also trip ML/link-farm rules; this catches the single-link variants that otherwise score clean. CRITICAL on its own: the /app/<id>/<slug>-game-hack path shape is unambiguous scam infra, and the host rotates so a host-list match can't be relied on.
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://netcdn.online/app/406889139/free-spins-coin-master-app-ios-game-hack In PDF document text
    • http://libnh.stikesnh.ac.id/repository/free-robux-please_GM431946152.pdfIn PDF document text
    • http://libnh.stikesnh.ac.id/repository/free-spin-coin-master-2021_GM406889139.pdfIn PDF document text
    • http://libnh.stikesnh.ac.id/repository/how-to-get-free-spins-on-coin-master-2021_GM406889139.pdfIn PDF document text
    • http://libnh.stikesnh.ac.id/repository/can-you-really-hack-coin-master-ios_GM406889139.pdfIn PDF document text
    • http://libnh.stikesnh.ac.id/repository/how-to-hack-coin-master_GM406889139.pdfIn PDF document text
    • http://libnh.stikesnh.ac.id/repository/robux-2021_GM431946152.pdfIn PDF document text
    • http://libnh.stikesnh.ac.id/repository/robux-free-ap_GM431946152.pdfIn PDF document text
    • http://libnh.stikesnh.ac.id/repository/free-robux-gen_GM431946152.pdfIn PDF document text
    • http://libnh.stikesnh.ac.id/repository/roblox-free-robux-google-chrome_GM431946152.pdfIn PDF document text
    • http://libnh.stikesnh.ac.id/repository/roblox-www-com_GM431946152.pdfIn PDF document text
    • http://libnh.stikesnh.ac.id/repository/can-you-hack-coin-master_GM406889139.pdfIn PDF document text
    • http://libnh.stikesnh.ac.id/repository/savagefrey-how-to-get-free-robux_GM431946152.pdfIn PDF document text
    • http://libnh.stikesnh.ac.id/repository/free-spin-link-for-coin-master_GM406889139.pdfIn PDF document text
    • http://libnh.stikesnh.ac.id/repository/free-coins-coin-master-hack_GM406889139.pdfIn PDF document text
    • http://libnh.stikesnh.ac.id/repository/how-to-earn-free-robux_GM431946152.pdfIn PDF document text
    • http://libnh.stikesnh.ac.id/repository/free-daily-spins-and-coins-for-coin-master_GM406889139.pdfIn PDF document text
    • http://libnh.stikesnh.ac.id/repository/wahoogaming-co-free-robux_GM431946152.pdfIn PDF document text
    • http://libnh.stikesnh.ac.id/repository/doctor-louie-roblox_GM431946152.pdfIn PDF document text
    • http://libnh.stikesnh.ac.id/repository/freerobux-co_GM431946152.pdfIn PDF document text
    • http://libnh.stikesnh.ac.id/repository/games-on-roblox-that-give-you-free-robux_GM431946152.pdfIn PDF document text
    • http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_004_off000050da.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x50DA 24636 bytes
SHA-256: 2f46a56311423474130f59f25304f21fe01263ca2a960f61fe4b6555e140fca9
font_01_sfnt_off00008995.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8995 2880 bytes
SHA-256: ade0b7cf4b51a8340bab06c0d2bef9a9667a97d8224eb14abb50da9e1aaabd55
font_02_sfnt_off00009381.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9381 17884 bytes
SHA-256: baa69023d18af7e6e292b7ed0352255ac8c665d65dfdd35f206937513cc9840e

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